JP3540173B2 - Instrument movement fixed structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movement fixing structure for an instrument in which a movement for driving a pointer on a dial is fixed to a wiring board.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, a structure for fixing a movement in an instrument for an automobile is as shown in FIG. In other words, the light from the light source 3 provided on the wiring board 1 is guided onto the dial 7 through the gap S formed between the side wall of the instrument case 5 and the dial 7, whereby the hands 9 And indirect lighting. A design such as a number on the dial 7 is illuminated by receiving light from the light source 3 directly from the back surface of the dial 7.
[0003]
On the back surface of the dial 7, a movement 11 for rotating and driving the hands 9 is arranged via a spacer 13. The movement 11 is fixed to a nut member 15 mounted on the wiring board 1 by fastening a screw 17. The nut member 15 is connected to a wiring pattern on the wiring board 1, while the screw 17 is connected to an electrical contact terminal on the movement 11 side. Therefore, by fastening the screw 17 to the nut member 15, the movement 11 And the wiring board 1 are electrically connected.
[0004]
As a method for fixing the movement 11 to the wiring board 1, in addition to using the screw 17 and the nut member 15 described above, an electrical contact terminal protruding from the movement 11 toward the wiring board 1 is connected to the wiring on the wiring board 1. Some are soldered to the pattern.
[0005]
In such a structure for fixing the movement 11 by screws or soldering, the screws 17 for fixing are required, and the work of fastening the screws 17 is complicated, and the workability of soldering is also poor. .
[0006]
On the other hand, as shown in FIG. 5, a spring terminal 19 is erected on the wiring board 1, and an electrical contact terminal to which the spring terminal 19 is fitted and connected is provided on the movement side. Some have made electrical connection easier. The spring terminal 19 is formed by winding a wire made of a conductor in a spiral shape like a coil spring, and the distal end side is easily elastically deformed, for example, swinging in a direction indicated by an arrow A in FIG. .
[0007]
[Problems to be solved by the invention]
By the way, since the spring terminal 19 in this case is intended to be electrically connected to the movement side, the spring terminal 19 has a structure that is easily elastically deformed to facilitate the fitting operation. Is insufficiently fixed. Therefore, another method for fixing the movement to the wiring board 1 is newly required. For example, the spacer 13 shown in FIG. 4 is provided with fixing legs protruding toward the wiring board 1, and the ends of the legs penetrate the wiring board 1 from the bottom surface of the instrument case 5 and protrude toward the movement. It is necessary to devise a method such as screwing the fixing boss.
[0008]
Therefore, even if the screw 17 for fixing the movement is abolished or the soldering operation is abolished by using the spring terminal 19, a new screwing operation is required, and the workability cannot be improved.
[0009]
Therefore, an object of the present invention is to facilitate the work of fixing the movement to the wiring board.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is a movement fixing structure for an instrument in which a movement for rotating a pointer on a dial is fixed to a wiring board, wherein an electrical contact terminal of the movement, The connection terminal is a configuration in which a movement is fitted and connected by installing the movement on a wiring board, and a spacer fixed to the movement is interposed between the movement and the dial, and the spacer is In a state where the electrical contact terminal and the connection terminal are fitted and connected, an engagement portion is provided which is engaged and fixed in an engagement hole formed in the wiring board, and the spacer is fixedly inserted from the dial side. It is configured to be fixed to the movement integrally with the dial by means of a tool .
[0011]
According to the movement fixing structure of the instrument having such a configuration, the engagement portion of the movement-side spacer is engaged with the engagement hole of the wiring board while the connection terminal of the movement and the connection terminal of the wiring board are fitted and connected. The movement is fixed to the wiring board. At this time, the movement is fixed to the spacer together with the dial by a fixture inserted from the dial side.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
FIG. 1 is an exploded perspective view of a main part of an automotive instrument provided with an instrument movement fixing structure according to an embodiment of the present invention. A printed wiring board 23 is mounted on the back of the instrument case 21, and a back cover 25 is mounted on the back of the instrument case 21 so as to cover the printed wiring board 23.
[0020]
On the front side of the instrument case 21, a dial 29 provided with a pointer 27 is mounted, and a facing and a front glass (not shown) are mounted. FIG. 2 is a perspective view of the dial 29 shown in FIG. 1 as viewed from the back, and a movement 31 for driving the hands 27 is provided.
[0021]
The movement 31 has an annular case cover 35 mounted on the outer periphery of a bobbin case 33 that houses a bobbin around which a coil (not shown) is wound. The case cover 35 has a locking claw 35a on the outer peripheral portion, and is fitted into the bobbin case 33 from the side opposite to the dial plate 29 so that the locking claw 35a is locked to the locking portion 37 integrated with the bobbin. Fixed. For a portion not shown in the drawing on the opposite side of the locking claw 35 a and the locking portion 37, the locking claw on the case cover 35 side is locked to the bobbin case 33.
[0022]
A terminal accommodating portion 41 for accommodating the electrical connection terminal 39 of the movement 31 is provided on the bobbin integrated with the locking portion 37 so as to protrude outside the bobbin case 33. A terminal guide portion 45 for guiding a spring terminal 43 similar to that shown in FIG. 5 as a connection terminal mounted on the printed wiring board 23 is provided on an outer peripheral portion of the case cover 35 corresponding to the terminal accommodating portion 41. Is formed. When the movement 31 is set on the instrument case 21 side, the spring terminal 43 is guided by the terminal guide portion 45, penetrates the terminal guide portion 45, and is connected to the electrical contact terminal 39.
[0023]
A spacer 47 is fixed to the back surface of the dial 29 by two screws 49 inserted from the front surface of the dial 29. The spacer 47 includes engaging legs 51 which are located on both sides of the terminal guide portion 45 and engage with the engaging holes 23a formed in the printed wiring board 15.
[0024]
An engagement portion 53 having an engagement claw 53a and an engagement protrusion 53b is formed at the tip of the engagement leg 51, and the engagement claw 53a is inserted into the engagement hole 23a to be provided on the back side of the printed wiring board 23. In the protruding state, the engagement protrusion 53b is located on the front surface side of the printed wiring board 23, whereby the spacer 47 is fixed to the printed wiring board 23.
[0025]
The base ends of the two engaging legs 51 facing each other are connected by a connecting portion 55, and the screw 49 is inserted into the connecting portion 55, and a surface of the connecting portion 55 on the side opposite to the dial 29 is provided. A part of the bobbin near the terminal accommodating portion 41 of the movement 31 abuts, and the inserted screw 49 is screwed into a part of the bobbin, whereby the movement 31 is fixed to the dial 29 together with the spacer 47.
[0026]
A positioning pin 57 is provided to protrude from the coupling portion 55 of the spacer 47 on the side of the terminal accommodating portion 41, and is inserted into a positioning hole formed in a bobbin near the terminal accommodating portion 41. Thus, the positioning between the spacer 47 and the movement 31 side is performed.
[0027]
The instrument case 21 is formed with a through hole 59 corresponding to the movement 31, and the through hole 59 is formed with three guide walls 61 serving as guides for setting the movement 31. The three guide walls 61 are arranged at predetermined positions in the circumferential direction in order to avoid interference with the terminal guide portions 45 and the engagement legs 51 on the movement 31 side.
[0028]
A bulb 63 as a light source for illumination is mounted on the printed circuit board 23, and the bulb 63 is exposed to the dial 29 side by an opening 65 continuous with the through hole 59 of the instrument case 21. ing. The light emitted from the bulb 63 is guided to the front side of the dial 29 from the gap between the side wall of the instrument case 21 and the dial 29, similarly to the conventional one shown in FIG. The pointer 27 is indirectly illuminated. The design on the dial 29 is illuminated by the light of the bulb 63 being directly radiated from the back of the dial 29.
[0029]
FIG. 3 is a cross-sectional view of a main part showing a state where the movement 31 is fixed to the printed wiring board 23. Here, the movement 31 attached to the dial 29 via the spacer 47 inserts the engaging claw 53 a at the tip of the engaging leg 51 of the spacer 47 into the engaging hole 23 a of the printed wiring board 23, and By protruding to the back side, the printed wiring board 23 is positioned between the engagement claw 53a and the engagement protrusion 53b, and the engagement portion 53 and the engagement hole 23a are engaged. Thus, the movement 31 is fixed to the printed wiring board 23 via the spacer 47.
[0030]
During this fixing operation, the spring terminals 43 on the printed wiring board 23 are guided by the terminal guides 45 and protrude toward the terminal accommodating portions 41 to be connected to the electrical contact terminals 39.
[0031]
As described above, the operation of fixing the movement 31 to the printed wiring board 23 only requires engaging the engaging portion 53 provided on the spacer 47 with the engaging hole 23a on the printed wiring board 23 side. This eliminates the need for fixing screws conventionally used, and eliminates the need for soldering work, making it extremely easy.
[0032]
Further, the spacer 47 in the indirect illumination structure for the pointer 27 replaces the prism used for the direct illumination structure for the pointer and fixes the movement 31, so that the movement 31 has the same shape. As long as the spacer is used, a similar spacer 47 can be used for a speedometer, a fuel gauge, and the like in addition to the tachometer shown in FIG.
[0033]
【The invention's effect】
As described above, according to the first aspect of the present invention, the engagement portion of the spacer on the movement side is engaged with the connection terminal on the wiring board while the connection terminal of the movement is connected to the connection terminal on the wiring board side. Since the movement is fixed to the wiring board via the spacer by engaging with the mating hole, the work of fixing the movement to the wiring board becomes extremely easy. Further, the movement can be easily fixed to the wiring board by the spacer fixed to the movement integrally with the dial.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a main part of an automotive instrument provided with an instrument movement fixing structure according to an embodiment of the present invention.
FIG. 2 is a perspective view of the dial shown in FIG. 1 as viewed from the back side.
FIG. 3 is a cross-sectional view of a main part showing a state where the movement in the fixing structure of FIGS. 1 and 2 is fixed to a printed wiring board.
FIG. 4 is a sectional view showing a conventional movement fixing structure.
FIG. 5 is a front view of a spring terminal on a wiring board connected to an electrical contact terminal of the movement.
[Explanation of symbols]
21 Instrument case 23 Printed wiring board (wiring board)
23a Engagement hole 27 Pointer 29 Dial 31 Movement 39 Electrical connection terminal 43 Spring terminal (connection terminal)
47 Spacer 53 Engagement part 53a Engagement claw 53b Engagement protrusion 63 Bulb (light source)

Claims (1)

In a movement fixing structure of an instrument, in which a movement for rotating and driving a pointer on a dial is fixed to a wiring board, an electric contact terminal of the movement and a connection terminal on the wiring board side are such that the movement is installed on the wiring board. A state in which a spacer fixed to the movement is interposed between the movement and the dial, and the electrical connection terminal and the connection terminal are fitted and connected to the spacer. An engaging portion is provided which is engaged and fixed in an engaging hole formed in the wiring board, and the spacer is fixed to the movement integrally with the dial by a fixing tool inserted from the dial side. The instrument's movement fixing structure.

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